Ryukyu Causeway

The Ryukyu Causeway was a rail causeway that linked four of the Ryukyu Islands (Okinawa, Okinoerabujima, Tokunoshima, and Amami Oshima). The causeway's construction was initiated on 16 October 1949 by Masazumi Doi's Isobe, and its goal was to link the Ryukyu Islands to facilitate civilian travel as well as to make it possible for future military bases to be connected to each other.